(b) Pick your favorite audio file as a .wav or mp3 file. Use MATLAB to read in the audio file (only one channel if its a dual channel input), plot the function as well as use the sound command to listen to the function.

(c) One common digital effect is an echo, where the audio will echo itself after some number of seconds. Design a signal [n] such that your audio signal convolved with h sounds like an echo or restarting of the audio. (Note: to get an appropriate delay in the echo, make sure you fill the signal with zeros to last a long time (e.g. Fs tells you the number of samples in 1 second of audio). The command: zeros(N, 1), will create a horizontal array with N zeros in it in MATLAB.